Combined lock and electric switch.



PATENTED PEB. 25, 1908. YLOR.

W. II. SHANNON C C. E. TA CCMEINEE LCCE .ENC ELECTRIC EIIIICII.

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llli @Y PATBNTTD TTB. 25, 1908. K. TAYLOR. ELECTRIC SWITCH.

W. M. SHANNON a G. COMBINED LOOK AND APPLICATION FILED JULY l, 1907.

UNITED STATES PATENT OFFICE.

WILLAM M. SHANNON ND GEORGE K. TAYLOR, OF COLiIMIA, SOUTH CAROLINA.

COMBINED LOCK AND ELECTRIC SWITCH.

Speccaton of Letters Patent.

Patented Feb. 25, 1908.

Appimion ned July 1.1907. seria No. 381.741.

To all whom it may concern:

Be-it known that we, WILLIAM M. SHAN- NoN and GEORGE K. TAYLOR, both citizens of the United States, and both residing in Columbia, county of Richland, State of /South Carolina, have invented certain new and useful Improvements in a Combined Lock and Electric Switch; and we do hereby' deci .re the yfollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

IThe invention relates to a dopr lock switch for electric lights and the like,` and is essentially intended -to provide a lock-controlled switch for oiiices and theflike, by means of which the lighting circuits in a room or apartment controlled by the door will be opened or disconnected when the person last leaving the room or apartment closesthe door, after having first thrown on the dead latch to prevent the door being o ened from the outside, except by a person iaving the proper key.

-well known form of cylinder lock and its strike, showing the relation of the switch to the lock. Fig. 2 is an edge view of the door. Fig. 3 is a horizontal section through the door and door j amb, illustrating the cooperation of the push button, and the. switch when the door is closed. Fig. 4 is a corresponding view showing Athe door in the operation of` closing. Fig. 5 is a pers ecti've view of the door in the operation ot c osing.

Referring to the drawings, a indicates the door, vand l) the jainb or casingwith which the sanieoperates. Mounted in the edge of the door in the usual manner is the lock, which is shown as a mortise cylinder lock of the well known Yale type, although it is to be understood, of course, that the invention is not limited to any articular form of door' lock, but may be app ied to locks generally, where This object is attained by ar` ranging one of the push buttons which con-y the lock is provided with the usual form of 4push buttonfor .controlling the dead latch.

strike 15 mounted in the door jamb. The n latch bolt 2 is operated by the usual form of divided hubQ, which latter is' of the ordinary construction to permit the bolt to be operated by the knobat all times from the inside of the roorn, but to permit said bolt to be operated by the knob from the outside only when the dead latch is otf, a key being required to retract the bolt when, the dead latch is n.

' Mounted in the lock casing is the usual form of cylinder 4, provided with 'a wing 5 which operates the boltto retract the latter by means of pivoted dogs 6 and 7.

Slidably mounted in the casing are .two push buttonsS and 11, the ends of which engage and are adapted to be proj eeted through suitable holes in the face -ot' the lock, which lies flush with the edge of the door. The inner end of push button 8 engages with a notch 9, in one member of the hub 10, to

nevertheless to` cause the outer end of said push button 11 to lieyfsubstantially Hush with the face of the lock when said push button 11 has been forced home. Preferably the outer end of push button 11 is made lsquare in cross sect-ion as at 11, and coperates with a square hole in the tace ot the lock, asshown in Fig. 2.

The lock strike 15, which is mounted on the door jamb, in position to cooperate with the latch bolt 2, is cut away or recessed at 17', to permit the passage of end 11 of push button 11 'when the lat-ter is advanced.

4Locatedin the door jamb, behind the lock strikeand secured to a face plate 16, which may be conveniently formed as an angular projection of the lock strike, vis a box or casing adapted to contain the switch which controls the circuit to the lights or other electrical apparatus in the room or apartment.

Said switch consists of stationary contacts 25 mounted upon a block of, insulation and connected with the leads 26, 26. The movable member yof the switch consists of a U-shap'ed contact having knife blades 2,4,

which coperate with a stationary contacty of the casing and the spacing block 22, so as tohold the bolt in position. to cause the movable contacts 24 to engage tlre 'fi red contacts 25 and establish the electrical circuits in the room. i

The operation of the device is as follows:

IDuring the time the room is occupied, push button 11 is usually retracted to permit the door to be opened by the knobsfrom either the inside o1' the outside. Under these conditions, the end 11 of said push button 11 .lies iiush with the face of theilock, viz., it does not project beyond the edge of the door. Plunger 2O under the iniiuence of its spring 21 therefore holds the switch in closed position, whether the door be open or closed. When the room or apartment is vacated, however, push button 8 is forced inward by the person leaving, to prevent the lock being operated by the outside knob, as hereinbefore described'. The inward movement of push button v8 causes push button 11 to bev moved outward, and, byreason of the greater extent ef movement of said push button, the

end 11 thereof is projected beyond the face,

breakthe circuit. `When the door isy opened,

however, the switch is closedl automatically and the circuits are established, and in order to maintain the circuit closed when a person is in the room, it is necessary tothrow off the dead latch by forcing said push button 1-1 inward, which correspondingly moves push dinary forms of lookv without/materially sedie? changing the construction of the latter, and that, whenr the lock and switch are combined in accordance with the invention, it is manifestly impossible for a person leaving an apartment and locking the door after him Ito leave the lights in the apartment burning.

Vhat we claim as our invention is:-

1. vIn a door lock switch for electric lighting circuits and thelike, the combination with a lock controlling push button which projects beyond the lock face when in advanced position, of a switch located in the door j amb and having a movable member in the path of movement of said push button whereby the switch is operated by the'closing of the door.'

2; In a door lock switch for electric lighting circuits and the like, the combination witha pair of push buttons which control the dead latch, one of which buttons projectsbeyond the lock face when in advanced position, of a switch located in the door jamb having a spring plunger foroperating the movable member of the switch and adapted to'be engaged by said projecting bolt as the door is closed.

3. ina door lock switch for electric lighting circuits and the like, the combination with the lock having a pair of push buttons to control Ithe operation of the dead latch, one of said push buttons projecting beyond the faceof the lock when in advanced position, of an electric switch located behind the lock-strike and having a spring plunger carryingthe movable contacts and lying in the path of -movement of said projecting bolt as the door is closed, said lock strike being 'recessed adjacent said plunger to permit the passage of the end of the push button.

4. ln a door lock switch for electric lighting circuitsand the like, the combination with the lock having a pair of push buttons to control the operation of the dead latch, one of said push buttons projecting beyond tion, of an electric switch mounted in the door jamb behindl the lock strike, said switch Y comprising a stationary contact and a movable contact normally engaging each other,

the face of the lock when in advanced posisaid movable contact lying in the path of movement of the projecting push button as the door closes, whereby the electric circuit is broken by the closing of the door.

In testimony whereof we affix our signatures, in presence of two witnesses.'

Witnesses:

J. M. CTY, W. S. NELSON. 

